1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <limits.h> 49 #include <stdio.h> 50 #include <unistd.h> 51 #include "un-namespace.h" 52 #include "local.h" 53 54 /* 55 * Small standard I/O/seek/close functions. 56 */ 57 int 58 __sread(cookie, buf, n) 59 void *cookie; 60 char *buf; 61 int n; 62 { 63 register FILE *fp = cookie; 64 65 return(_read(fp->_file, buf, (size_t)n)); 66 } 67 68 int 69 __swrite(cookie, buf, n) 70 void *cookie; 71 char const *buf; 72 int n; 73 { 74 register FILE *fp = cookie; 75 76 return (_write(fp->_file, buf, (size_t)n)); 77 } 78 79 fpos_t 80 __sseek(cookie, offset, whence) 81 void *cookie; 82 fpos_t offset; 83 int whence; 84 { 85 register FILE *fp = cookie; 86 87 return (lseek(fp->_file, (off_t)offset, whence)); 88 } 89 90 int 91 __sclose(cookie) 92 void *cookie; 93 { 94 95 return (_close(((FILE *)cookie)->_file)); 96 } 97 98 /* 99 * Higher level wrappers. 100 */ 101 int 102 _sread(fp, buf, n) 103 FILE *fp; 104 char *buf; 105 int n; 106 { 107 int ret; 108 109 ret = (*fp->_read)(fp->_cookie, buf, n); 110 if (ret > 0) { 111 if (fp->_flags & __SOFF) { 112 if (fp->_offset <= OFF_MAX - ret) 113 fp->_offset += ret; 114 else 115 fp->_flags &= ~__SOFF; 116 } 117 } else if (ret < 0) 118 fp->_flags &= ~__SOFF; 119 return (ret); 120 } 121 122 int 123 _swrite(fp, buf, n) 124 FILE *fp; 125 char const *buf; 126 int n; 127 { 128 int ret; 129 130 if ((fp->_flags & __SAPP) && _sseek(fp, (fpos_t)0, SEEK_END) == -1) 131 return (-1); 132 ret = (*fp->_write)(fp->_cookie, buf, n); 133 /* __SOFF removed even on success in case O_APPEND mode is set. */ 134 if (ret >= 0) { 135 if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) && 136 fp->_offset <= OFF_MAX - ret) 137 fp->_offset += ret; 138 else 139 fp->_flags &= ~__SOFF; 140 141 } else if (ret < 0) 142 fp->_flags &= ~__SOFF; 143 return (ret); 144 } 145 146 fpos_t 147 _sseek(fp, offset, whence) 148 FILE *fp; 149 fpos_t offset; 150 int whence; 151 { 152 fpos_t ret; 153 int serrno, errret; 154 155 serrno = errno; 156 errno = 0; 157 ret = (*fp->_seek)(fp->_cookie, offset, whence); 158 errret = errno; 159 if (errno == 0) 160 errno = serrno; 161 /* 162 * Disallow negative seeks per POSIX. 163 * It is needed here to help upper level caller 164 * in the cases it can't detect. 165 */ 166 if (ret < 0) { 167 if (errret == 0) { 168 fp->_flags |= __SERR; 169 errno = EINVAL; 170 } 171 fp->_flags &= ~__SOFF; 172 ret = -1; 173 } else if (fp->_flags & __SOPT) { 174 fp->_flags |= __SOFF; 175 fp->_offset = ret; 176 } 177 return (ret); 178 } 179